Berkeley Software Distribution (BSD, sometimes called Berkeley Unix) is a UNIX operating system derivative developed and distributed by the Computer Systems Research Group (CSRG) of the University of California, Berkeley, from 1977 to 1995. Historically, BSD has been considered a branch of UNIX - "BSD UNIX", because it shared the initial codebase and design with the original AT&T UNIX operating system. In the 1980s, BSD was widely adopted by vendors of workstation-class systems in the form of proprietary UNIX variants such as DEC ULTRIX and Sun Microsystems SunOS. This can be attributed to the ease with which it could be licensed, and the familiarity it found among the founders of many technology companies of this era. Though these proprietary BSD derivatives were largely superseded by the UNIX System V Release 4 and OSF/1 systems in the 1990s (both of which incorporated BSD code), later BSD releases provided a basis for several open source development projects that continue to this day. Today, the term "BSD" is often non-specifically used to refer to any of these BSD descendants, e.g., FreeBSD, NetBSD, OpenBSD or DragonFly, which together form a branch of the family of Unix-like operating systems. (Excerpt from <a href="http://en.wikipedia.org/wiki/Berkeley_Software_Distribution">Wikipedia article: BSD</a>)

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BSD licenses are a family of permissive free software licenses. The original license was used for the Berkeley Software Distribution (BSD), a Unix-like operating system after which it is named. The original owners of BSD were the Regents of the University of California because BSD was first written at the University of California, Berkeley. The first version of the license was revised, and the resulting licenses are more properly called modified BSD licenses. Two variants of the license, the New BSD License/Modified BSD License, and the Simplified BSD License/FreeBSD License have been verified as GPL-compatible free software licenses by the Free Software Foundation, and have been vetted as open source licenses by the Open Source Initiative, while the original, 4-clause license has not been accepted as an open source license and, although the original is considered to be a free software license by the FSF, the FSF does not consider it to be compatible with the GPL due to the advertising clause. The licenses have fewer restrictions on distribution compared to other free software licenses such as the GNU General Public License or even the default restrictions provided by copyright, putting works licensed under them relatively closer to the public domain. (Excerpt from <a href="http://en.wikipedia.org/wiki/BSD_licenses">Wikipedia article: BSD license</a>)

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